func main() {
    // For-range loop
    for (i in 0..10) {
       print(i);
    }

    // For-value loop
    array = [];
    for (v in array) {
        print("v = " + v);
    }
    array = [1, 2, 3];
    for (v in array) {
        print("v = " + v);
    }

    // For-key-value loop
    dict = {};
    for (k, v in dict) {
        print("key = " + k + ", value = " + v);
    }
    dict = {aaa: "123", bbb: "456"};
    for (k, v in dict) {
        print("key = " + k + ", value = " + v);
    }
}
